High Performance Heated SocksThe heated socks are equipped with a pair of large 5000mAh batteries whose heating time is up to 10 hours. The heating elements cover the entire toe area and help focus the heat in the toes to keep your feet warm. The heating elements are made of carbon fiber which provides excellent durability and safety standards. Perfect for arthritis in the feet and chronically cold feet and stiff joints. The heated socks can keep your feet warm all day long. MaterialMade of 78 cotton, 20 polyester, 2 spandex material, the socks are absorbent, breathable, quick-drying, elastic thickened. Soft padded reinforced heel & toe, and recessed heating elements help focus the heat in the toes to keep your feet warm. They are lightweight and not bulky while still covering the calf. Smart APP Control If you are looking for the button inside the heated ski socks in the snow outdoors, you not only have to bend over, but also touch your ski pants or ski boots, which is a terrible experience. If you have these heated socks with APP, you can adjust the temperature of the heated socks at will. Adjustable Temperature SettingThese heated socks are designed with 3 heat settings, including high heat-red (140-150, 4.5-5.5 hours), medium heat-green (130-135, 6-7.5 hours) and low heat-blue (110-115, 9-10 hours) making these electric heated socks ideal for keeping your feet warm in winter. Unisex heated socks, long cotton socks can cover the calf, fashionable design can match different clothes perfectly, so there is no need to worry about matching. The package includes 1 pair of heated socks, 2*rechargeable batteries, 2*USB charging cables, 1*manual.